Combined Suppression of the Intrarenal and Circulating Vasoconstrictor Renin-ACE-ANG II Axis and Augmentation of the Vasodilator ACE2-ANG 1-7-Mas Axis Attenuates the Systemic Hypertension in Ren-2 Transgenic Rats Exposed to Chronic Hypoxia
PBN-AR
Instytucja
Instytut Medycyny Doświadczalnej i Klinicznej im. Mirosława Mossakowskiego Polskiej Akademii Nauk
Informacje podstawowe
Główny język publikacji
en
Czasopismo
Physiological Research
ISSN
0862-8408
EISSN
Wydawca
ACAD SCIENCES CZECH REPUBLIC, INST PHYSIOLOGY
DOI
URL
Rok publikacji
2015
Numer zeszytu
1
Strony od-do
11-24
Numer tomu
64
Identyfikator DOI
Liczba arkuszy
1,50
Słowa kluczowe
en
Hypertension
Chronic hypoxia
Renin-angiotensin system
Open access
Tryb otwartego dostępu
Inne
Wersja tekstu w otwartym dostępie
Wersja opublikowana
Licencja otwartego dostępu
Inna
Czas opublikowania w otwartym dostępie
Razem z publikacją
Streszczenia
Język
en
Treść
The aim of the present study was to test the hypothesis that chronic hypoxia would aggravate hypertension in Ren-2 transgenic rats (TGR), a well-defined monogenetic model of hypertension with increased activity of endogenous renin-angiotensin system (RAS). Systolic blood pressure (SBP) in conscious rats and mean arterial pressure (MAP) in anesthetized TGR and normotensive Hannover Sprague-Dawley (HanSD) rats were determined under normoxia that was either continuous or interrupted by two weeks' hypoxia. Expression, activities and concentrations of individual components of RAS were studied in plasma and kidney of TGR and HanSD rats under normoxic conditions and after exposure to chronic hypoxia. In HanSD rats two weeks' exposure to chronic hypoxia did not alter SBP and MAP. Surprisingly, in TGR it decreased markedly SBP and MAP; this was associated with substantial reduction in plasma and kidney renin activities and also of angiotensin II (ANG II) levels, without altering angiotensin-converting enzyme (ACE) activities. Simultaneously, in TGR the exposure to hypoxia increased kidney ACE type 2 (ACE2) activity and angiotensin 1-7 (ANG 1-7) concentrations as compared with TGR under continuous normoxia. Based on these results, we propose that suppression of the hypertensiogenic ACE-ANG II axis in the circulation and kidney tissue, combined with augmentation of the intrarenal vasodilator ACE2-ANG 1-7 axis, is the main mechanism responsible for the blood pressure-lowering effects of chronic hypoxia in TGR.
Cechy publikacji
ORIGINAL_ARTICLE
Inne
System-identifier
626569